40642861 has 4 divisors (see below), whose sum is σ = 46448992. Its totient is φ = 34836732.

The previous prime is 40642841. The next prime is 40642883. The reversal of 40642861 is 16824604.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-40642861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40642841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2903055 + ... + 2903068.

It is an arithmetic number, because the mean of its divisors is an integer number (11612248).

Almost surely, 2^40642861 is an apocalyptic number.

It is an amenable number.

40642861 is a deficient number, since it is larger than the sum of its proper divisors (5806131).

40642861 is an equidigital number, since it uses as much as digits as its factorization.

40642861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5806130.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 40642861 is about 6375.1753701369. The cubic root of 40642861 is about 343.8175890897.

The spelling of 40642861 in words is "forty million, six hundred forty-two thousand, eight hundred sixty-one".